feat(workers): Define WorkerState for the Data Analyst subgraph

backend/tests/test_data_analyst_state.py

@@ -0,0 +1,17 @@
+from typing import get_type_hints, List
+from langchain_core.messages import BaseMessage
+from ea_chatbot.graph.workers.data_analyst.state import WorkerState
+
+def test_data_analyst_worker_state():
+    """Verify that DataAnalyst WorkerState has the required fields."""
+    hints = get_type_hints(WorkerState)
+    
+    assert "messages" in hints
+    assert "task" in hints
+    assert hints["task"] == str
+    
+    assert "code" in hints
+    assert "output" in hints
+    assert "error" in hints
+    assert "iterations" in hints
+    assert hints["iterations"] == int